Since pathogens are easily passed from person to person, they need large populations to spread and survive. If they did not have a large population, the pathogens would die out.
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diaphragm
The diaphragm is a C-shaped structure of muscle and fibrous tissue that separates the thoracic cavity from the abdomen. The dome curves upwards.
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oatmeal, apples, peas, carrots, beans and pears
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A biome is a large naturally occurring community of flora and fauna occupying a major habitat
I believe it is D. I researched it and it explained the same thing as D